linux shell 實用腳本

測試IP地址

#/bin/bash

for i in  1 2 3 4 5 6 7 8 9
do
    echo "the number of $i computer is "
    ping -c   5 192.168.0.$i      #ping -c 5  是指ping 5次後停止。

done

/******************************************************************/

判斷test.sh 的大於指定大小 刪除 本目錄下其他文件

#!/bin/bash
a=2
while name="test.sh"
do
  sleep 1
  b=$(ls -l $name | awk '{print $5}' )
  if test $b -ge $a
  then
     `rm awktest`
      exit 0
  fi
done

/******************************************************************/

11.從0.sh中讀取內容並打印

#/bin/bash
while read line
do
    echo $line
done < 0.sh

/******************************************************************/

從1.sh中讀取每一行加一打印

#!/bin/bash

test -e 1.sh
while read line
do

   a=$(($line+1))-------》1.sh中包含非數字默認爲0

#或#

   a=`expr $line + 1`    ----》1.sh中包含非數字報錯
   echo $a

done<1.sh

/******************************************************************/

#!/bin/bash

p_num()
{
echo "$1"    #$1:傳遞給函數的第一個參數
}

for n in $@  #$@ ：傳遞給腳本的所有參數
do
p_num $n    
done

/******************************************************************/

#!/bin/bash

while :
do
  echo " please input file's name"
  read a
  if test -e ~/shell/$a                             # -e ：檢測文件是否存在
   then
     echo "the file is existing please input new file name"
  else
     mkdir $a
     echo "you are susscesful"
     break
  fi
done

/******************************************************************/

獲取本機IP地址

#/bin/bash
ifconfig | grep "inet addr:" | awk '{ print $2 }'| sed 's/addr://g'

/******************************************************************/

獲取當前用戶

#/bin/bash
echo "Current User is :"
echo $(ps | grep "$$" | awk '{print $2}')

/******************************************************************/

case 練習

#!/bin/bash
clear
echo "enter a number from 1 to 5:"
read num
case $num in
    1) echo "you enter 1"
    ;;
    2) echo "you enter 2"
    ;;
    3) echo "you enter 3"
    ;;
    4) echo "you enter 4"
    ;;
    5) echo "you enter 5"
    ;;
    *) echo "error"
    ;;
esac

/******************************************************************/

內置命令練習

#/bin/bash

    clear
        echo "Hello, $USER"
        echo
       
        echo "Today 's date id `date`"

        echo

        echo "the user is :"
        who
        echo

        echo "this is `uname -s`"
        echo

        echo "that's all folks! "

/******************************************************************/

檢測指定端口是否有服務佔用

#!/bin/bash

clear
n=1

echo "check XXX servers..."

while :
do
  if test $n -gt 20
  then
    echo "XXX servers was falid"
    break
  fi

  sleep 3
  n=$(($n+1))
  port=`netstat -antp | grep "0.0.0.0:80"`

  if [ ${#port} -gt 3 ];  then
     echo "XXX servers is started"
     break
  fi
done

/******************************************************************/